Header Value Key Word Format Type Unit Comment --------+-----+---------+-------+----------------------------------------------------+------------ O_MSK %30s string MASK name of OH Suppression O_SLT %30s string OHS slit O_SLTLEN %7.3f double arcsec OHS slit length (arcsec) O_SLTWID %7.3f double arcsec OHS slit width (arcsec) O_FOCVAL %7.3f double OHS FOCUS Value